Two kinds of oxygen vacancies in lithium titaniate doped with copper as detected by EPR

Marcin Stanisław Łapiński; Lidia Piekara-Sady; Robert Kozioł; Wojciech Sadowski; Barbara Kościelska

doi:10.1016/j.solidstatesciences.2020.106337

Two kinds of oxygen vacancies in lithium titaniate doped with copper as detected by EPR

Abstract

Lithium titanate (Li1+xTi2-xO4) doped with Cu2+ ions was synthesized by sol-gel processing method. The structure and morphology are characterized by X-ray Diffraction (XRD), X-ray Photoemission Spectroscopy (XPS), Scanning Electron Microscopy (SEM) and Electron Paramagnetic Resonance (EPR). Spin Hamiltonian parameters describing Zeeman and hyperfine interaction for 63Cu2+ ions were obtained from EPR spectra simulations. The spectra are characteristic for (Cu-VO)0 close-associate pairs consisting of copper replacing Ti4+ ion and an adjacent doubly ionized oxygen vacancy. These oxygen vacancies serve as charge compensators for the substituting copper ions. However, there are additional narrow EPR signals at g = 2.004 in all samples, including the sample of LiTi2O4 without dopant. These signals are ascribed to single-electron trapped oxygen vacancies VO●. Superconductivity was not confirmed down to 4.2 K by magnetic measurements in all samples studied.

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Authors (5)

Marcin Stanisław Łapiński (formerly: Marcin Łapiński) dr hab. inż.
Lidia Piekara-Sady
Robert Kozioł mgr inż.
Wojciech Sadowski prof. dr hab. inż.
Barbara Kościelska prof. dr hab. inż.

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Category:: Articles
Type:: artykuły w czasopismach
Published in:: SOLID STATE SCIENCES no. 106,
ISSN: 1293-2558
Language:: English
Publication year:: 2020
Bibliographic description:: Łapiński M., Piekara-Sady L., Kozioł R., Sadowski W., Kościelska B.: Two kinds of oxygen vacancies in lithium titaniate doped with copper as detected by EPR// SOLID STATE SCIENCES -Vol. 106, (2020), s.106337-
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.solidstatesciences.2020.106337
Verified by:: Gdańsk University of Technology